package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/*
* 自定义切面，实现公共字段自动填充
* */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /*
    * 切入点
    * */
    @Pointcut("execution(* com.sky.mapper.*.*(..))&&@annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始公共字段自动填充...");
        //获得当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上注解对象
        OperationType operationType = autoFill.value();//获取数据库操作类型
        //获取被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(args==null ||args.length!=0){
            return;
        }
        Object entiy=args[0];
        //准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据当前不同的操作，利用反射进行赋值
        if(operationType==OperationType.INSERT){
            //为4个公共属性赋值
            try {
                Method setCreateTime = entiy.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entiy.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entiy.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = entiy.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射为对象属性赋值
                setCreateTime.invoke(entiy,now);
                setCreateUser.invoke(entiy,currentId);
                setUpdateTime.invoke(entiy,now);
                setUpdateUser.invoke(entiy,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }


        } else if (operationType==OperationType.UPDATE) {
            //为2个公共属性赋值
            try {
                Method setUpdateTime = entiy.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entiy.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(entiy,now);
                setUpdateUser.invoke(entiy,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }
}
